/**
 * Copyright 2011-2011 - Members of the Chaupal Community
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package net.chaupal.Impl.Unique;

import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Generates a sequence of uniques, using atomic objects.
 */
public enum Unique {
    
    INSTANCE;
    
    private static final AtomicInteger ints
            = new AtomicInteger(Integer.MIN_VALUE);
    
    private static final AtomicLong longs
            = new AtomicLong(Long.MIN_VALUE);
    
    /**
     * Provide the next unique integer.
     * 
     * @return the next unique integer
     */
    public static int nextInt() {
        return ints.getAndIncrement();
    }
    
    /**
     * Provide the next unique long.
     * 
     * @return the next unique long
     */
    public static long nextLong() {
        return longs.getAndIncrement();
    }

}
